HP ProBook 4420s Support Question

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Question posted by Anonymous-133504 on April 2nd, 2014

How Switch On Keyboard Light

how switch on keyboard light

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Answer #1: Posted by waelsaidani1 on April 2nd, 2014 4:02 AM

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waelsaidani1

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If the spacebar has a keyboard icon on the left side, press and hold the fn key and then tap the space bar one time. If your notebook computer has a backlit keyboard, there is a special key on the keyboard to turn the light on and off. The key is a 3 dots with a bright attached to the end of the dot. You can also try the

Press the f12 key.

Press the f5 key.

Related HP ProBook 4420s Manual Pages

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 1

... on identifying computer features, components, and spare parts; and performing computer disassembly procedures. troubleshooting computer problems; HP ProBook 4320s Notebook PC HP ProBook 4321s Notebook PC HP ProBook 4420s Notebook PC HP ProBook 4421s Notebook PC Maintenance and Service Guide SUMMARY This guide is a troubleshooting reference used for maintaining and servicing the computer.

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 5

Table of contents 1 Product description ...1 2 External component identification ...9 Identifying hardware ...9 Top components ...10 TouchPad ...10 Lights ...11 Buttons, speakers, switches, and fingerprint reader (select models only 12 Keys ...13 Front components ...14 Right-side components ...15 Left-side components ...16 Bottom components ...17 Display ...18 ...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 6

Workstation guidelines 46 Equipment guidelines 47 Component replacement procedures 48 Serial number label ...48 Computer feet ...48 Battery ...49 SIM ...50 Switch cover ...51 Keyboard ...53 Memory module ...55 Optical drive ...57 Power button board ...59 Speakers ...60 WWAN module ...62 Palm rest ...64 Hard drive ...66 RTC battery ...68 ...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 9

... description Category Product Name Processors Chipsets Graphics Panels Description HP ProBook 4320s HP ProBook4 320s / 4321s HP ProBook 4420s HP ProBook 4421s UMA Discrete UMA Discrete HP ProBook 4320s Notebook PC √ √ NOTE: Discrete not for use in the People's Republic of China. HP ProBook 4321s Notebook PC √ NOTE: For use in ) HD (1366×768 resolution...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 12

Category Ethernet Wireless External media cards Ports Description HP ProBook 4320s HP ProBook4 320s / 4321s HP ProBook 4420s HP ProBook 4421s UMA Discrete UMA Discrete Supports no modem option √ √ √...RJ-11 (modem) √ √ √ √ RJ-45 (Ethernet, includes link and activity lights) √ √ √ √ 4 Chapter 1 Product description

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 13

... HP ProBook4 320s / 4321s HP ProBook 4420s HP ProBook 4421s UMA Discrete UMA Discrete USB 2.0 (3) √ √ √ √ Combo eSATA...Multi-pin AC power √ √ √ √ Keyboard and 33.8-cm (13.3-in) keyboard with TouchPad pointing devices √ √ 35.6-cm (14.0-in) keyboard with TouchPad √ √ TouchPad only, with 2 TouchPad buttons...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 16

... 4320s HP ProBook4 320s / 4321s HP ProBook 4420s HP ProBook 4421s UMA Discrete UMA Discrete Microsoft Office Ready DVD √ √...√ √ √ √ √ √ √ √ √ √ √ √ Bluetooth module Keyboard Speaker assembly √ √ √ √ √ √ √ √ √ √ √ √...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 26

On: The webcam is on. Records sound. Component (1) Internal display switch (2) Internal microphone (3) Webcam light (select models only) (4) Webcam (select models only) Description Turns off the display if the display is closed while the power is in this section. Records ...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 31

... with webcam, red 608742-001 ● 35.6-cm (14.0-in) HD with webcam, red 608743-001 Switch cover (includes power button board) ● For with 33.8-cm (13.3-in) displays ● For ...in) displays, red 599567-001 607652-001 599568-001 607653-001 Power button board (included with switch cover) Keyboard In computer models with 33.8-cm (13.3-in) displays: ● For use in Belgium ●...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 48

... kit Speaker assembly, 33.8-cm (13.3-in) Switch cover (includes power button board), 33.8-cm (13.3-in) Switch cover (includes power button board), 35.6-cm (...14.0-in) Top cover, for use with 33.8-cm (13.3-in) models Top cover, for use with 35.6-cm (14.0-in) models Webcam module Keyboard, 33.8-cm (13.3-in), for use in the United States Keyboard...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 50

...001 608736-001 608737-001 608738-001 608739-001 608740-001 608741-001 608742-001 608743-001 Description Keyboard, 35.6-cm (14.0-in), for use in French Arabic region Processor heat sink for use with ...displays, red Palm rest with Touchpad for use with 35.6-cm (14.0-in) displays, red Switch cover, 33.8-cm (13.3-in), red Switch cover, 35.6-cm (14.0-in), red System board, for use with 35.6-cm (14.0-in...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 60

Slide the switch cover back (1), and then remove it from the computer (2). Reverse this procedure to install the switch cover and keyboard. 52 Chapter 4 Removal and replacement procedures 4.

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 61

...: On computer models with 35.6-cm (14.0-in) displays: 599573-xxx NOTE: For a detailed list of keyboards see Switch cover on page 49). 5. Remove the switch cover (see the parts list in Hibernation, turn the computer on page 22 Before removing the keyboard, follow these steps: 1. Disconnect all external devices connected to the computer.

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 63

... slot to the computer. 3. Remove the switch cover (see Battery on page 53). Memory module Description Memory module (PC3-10600, 1333-MHz, DDR3, shared) 2048-MB 1024-MB Spare part number 598856-002 598859-002 Before removing the memory module, follow these steps: 1. Remove the keyboard (see Keyboard on page 49). 5. Shut down...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 65

...removing the optical drive, follow these steps: 1. Component replacement procedures 57 Remove the switch cover (see Switch cover on page 49). 5. Insert a flat-bladed screwdriver or similar tool into ...the access point on page 53) NOTE: You can release the keyboard without removing the keyboard cable ...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 76

... outlet and then unplugging the AC adapter from the system board (2). Palm rest (see Keyboard on page 53) d. Remove the RTC battery from the computer. 4. RTC battery Description... the computer on page 49) b. Keyboard (see Palm rest on page 51) c. Reverse this procedure to the computer. 3. Remove the following components: a. Battery (see Switch cover on page 64) Remove the ...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 78

..., turn the computer on page 51) b. The white WLAN antenna cable is off or in your country or region. Keyboard (see Battery on the WLAN module. Position the computer right-side up with a wireless module authorized for use in Afghanistan..., the Solomon Islands, Somalia, South Africa, South Korea, Spain, Sri Lanka, St. Palm rest (see Switch cover on , and then shut it down the computer...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 80

...battery (see Battery on page 53) c. Remove the following components: a. Keyboard (see Switch cover on page 64) Remove the Bluetooth module: 1. Disconnect the Bluetooth module cable (2), and then remove... the Bluetooth module. 4. Switch cover (see Keyboard on page 49). 5. Position the computer right-side up with the front toward...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 82

... computer. 4. Remove the Phillips PM2.5×5.0 screw (2) that secure the heat shield to the top cover. 3. Switch cover (see Battery on page 49). 5. Remove the battery (see Switch cover on page 53) c. Palm rest (see Keyboard on page 51) b. Remove the six Phillips PM2.5×3.0 screws (1) that secures the heat shield to the...

HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Maintenance and Service Guide - Page 159

... 36 HP QuickLook 2 110 HP SpareKey enrollment 108 I internal display switch, identifying 12, 18 internal microphone, identifying 18 J jacks audio-in (...headphone) 14 RJ-11 (modem) 15 RJ-45 (network) 16 K keyboard product description 5 removal 53 spare part number 23, 53 keys embedded ...legacy support, USB 98, 103, 104, 110, 112 , 116 lights AC adapter 16 caps lock 11 drive 14 optical drive 15 power ...